Depends how young each poster thinks counts as a "young'un" these days
Usenet and IRC aren't even that far apart historically. Both are now decades-old, far older than the time that separates each of their creation(s). It's all about the community. I've seen as bad flamewars on forums as I have on Discord as I have on some of my oldest and most lawless IRC server communities.
I've been on forums where people were temp banned as a form of reputation. I've seen people treat being kicked from IRC channels as a right of passage. This culture was embedded in the community, and not really relevant to the actual tools being used. That's the rub I think.